Change browser/page action default icon defined in manifest to support hidpi.

chrome/common/extensions/extension.h

Index: chrome/common/extensions/extension.h
diff --git a/chrome/common/extensions/extension.h b/chrome/common/extensions/extension.h
index 55e8d2ab319feccc5b26c2d492ee9ffc39f7fefe..d0aef2a9b261103feb8e78ebfd44b6f9954c5705 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -629,8 +629,7 @@ class Extension : public base::RefCountedThreadSafe<Extension> {
     return !omnibox_keyword().empty() ||
            browser_action() ||
            (page_action() &&
-               (page_action_command() ||
-                !page_action()->default_icon_path().empty()));
+               (page_action_command() || page_action()->default_icon()));
   }
   const FileBrowserHandlerList* file_browser_handlers() const {
     return file_browser_handlers_.get();